Say what you will about Def Leppard. Sure, the multiplatinum '80s rock band that topped pop charts all over the world with its sugary metal hooks is something of an anachronism in 2011. But to the credit of the band, which has toured seemingly nonstop for most of its 30-plus years, it has also consistently released new material along the way. Four records in the '80s, three in the '90s...

Weren't the 80s a great time for rock &amp; roll. How much do you remember? It used to be that only the rich could afford a large music/video library, but with the Internet everybody can get all the music they want free from YouTube. Ditto goes for information on rock music stars and history from Wikipedia. To finally systematically master rock and roll history all one needs is a map of links that lay it out. Guess what? It's now available totally free for all with the Historyscoper's new Rock and Roll Historyscope. To get started just click: